Sound and picture record film



June 6, 1933. J. G. cAPsTAFF SOUND AND PICTURE RECORD FILM Filed Aug.30; 1929 :JM/vento@ Hlll 24 Patented June 6, 1933 UNITED STATES PATENTOFFICEv JOHN CAPSTAFF, 0l' ROCHESTER, NEW YORK, ASSGNOR TO EASTIAH KODAKOOI- PANY, Ol' ROCHESTER, NEW YORK, A CORPORATION 0F NEW YORK l SOUND.AND PICTURE RECORD FILI Application mea aufm so, 192s. semi no. saam.

This invention relates to film to be used for the projection of motionpictures in color and for the reproduction of sound. Several methodshave been proposed for the formation of a motion picture film having auniformly colored picture area and an untinted sound record area.'Ilhese methods call for considerable delicac in manufacture, and are,in general, appllcable to film only after it has been slit into thenarrow widths needed for motion picture use.

M invention involves the tinting uniformly o a strip of film of thewidth at which it comes from the film forming wheels and before it isslit into the narrow widths. There is thus formed upon one surface ofthe film a uniform tint, and the reverse surface is coated withemulsion.

Either before or after the emulsion coating is applied, the film ispassed through an apparatus which scrapes or grinds the color fromnarrow strips which ,are afterwards used as sound record areas. Thisoperation may also be performed after the film has been slit into narrowwidths and particularly may be done at the time of perforation and l inthe same machine.

Reference will now be made to the accompanyin drawing, in the severalfigures of which t e same reference characters indicate the same parts,and in which:

Figure 1 is a perspective view of a machine used in carrying out myinvention.

Figure 2 is a perspective view of a different machine for carrying outmy inven.V

tion in another way.

Figure 3 shows a section of unperforatedv film embodying my invention.

Figure 4 shows a combined perforator and scraper upon which my inventionmay be practiced.

Figure 5 shows a strip of film embod ing my invention, Figure 6 is asection o the `film shown in Fi re 5, and Figure 7 is a section of filmldisc osing another embodiment of my invention.

The film support used for hotographic purposes is ma e in rather wi ebands and customarily these are sensitized and then slit into narrowbands for use in motion picture measured, slight posts "12. These slitpurposes and other photographic uses. This A with a dye giving a uniformtint to that surface of the film. This is a ermanent color or tint whichis not materia y or noticeably affected by the photographic processesand baths. This comprises a dye in a solvent which penetrates thematerial of the film support to an extent greater than' does theordinary photographic bath to which the support is practicallyimpervious. It incorporates in and on one surface of the film a' dyelayer, which is permanent for all photographic and motion picturepurposes. The extent to which it netrates the film is, when eing usuallynot over .001 inch, but is sufficient for the purpose outlined. I' takesuch a wide band, 1,' as shown in Figure 1, in the width at which it ismanufactured and, before it is coated with a sensitized emulsion, passit with the dyed surface uppermost through a scraping device of the typeshown... This consists of two upright end supports 2, connected by a.cross support `3, through which pass vertically a series of Scrapers 4,held in adjusted positions by thumb screws 5. Beneath these Scrapers isa large roll 6 and the film 1 passes over this roll and beneath thecutting ends 7 of the Scrapers. In the illustrations only a few Scrapersare shown, but in practice there would be a much larger number.

After the film has passed the cutting edges 7 it will be uniformlycolored except for the scraped portions which will extend as clearAstrips 8. The knives will be so adjusted that they will remove justenough of the surface of the film to give a clear track. The film thenpasses beneath cuttin disks 10 mounted on a common driving sha t 11supported in the film into the desired widths and the resulting narrowbands 14 then pass beneath the suction squeegee 13, by which the looseparticles formed in the scraping and slitting operations are removed.

The film is now in the form of a series of narrow bands 14, each havinga clear track 8 upon it. These bands are separately wound up, this notbeing shown in the drawing.

2 Lerares A second :nethod of removing the dye may ne performed on theapparatus shown in Fig-- ure 2, which is the same in every respect as'that shown in Figure l, except that in place 5 of the fixed cuttingknives 4, there are 'a series of grindingrollers 16 which rotate andgrind away a very slight portion of the dyed surface of the lln, leavingthe Clear sound track as before.

here is shown in Figure 3 a small section one of the narrow bands 14 inthe forni in which it leaves the apparatus shown in igures l or 2. lfdesired, the film may be lit in the usual Way Without the formation of"ne clear areas at the time of slitting. rlhe uniformly tinted hand thusproduced may be passed through an apparatus indicated diagrammaticaliyin Figure 4, in which 20 is a perforating head forming the usual per- 20forations 2l found upon motion picture film. After. the lm has passedthe perforator it passes beneath a scraping knife 19 which performs thesame operation as one of the knives shown in Figure l. The film, afterleaving 25 the perforator, is of the type shown in Figure 5, having theclear sound track 8 and the uniforrniy tinted picture area 22.

fit is to he understood that the sensitive emulsion is applied to thesurface of the film 8o at any appropriate stage in manufacture. if theclear area is formed before the film is sensitized, this sensitive layer25 may be applied over the dye layer 24 on support 26 as shown in Figure7 or it may be applied on the opposite surface as indicated in Figure 6.The extent of the cut and the thickness of the dye iayer are muchexaggerated in Figures 6 and 7. referably a protective varnish layer 23is applied over the dye layer 24 as o shown in -`Figure 6.

Having thus described my invention, what i ci iin as and desire tosecure by Let- Q G n ,n r9 ranuiacture of: nlm useful for the sin" eensreproduction Inotion pictures a single coor and of sound, the steps gir'one surface rdm support a o yl caa-alie of penetrating and percoicfingtne surface n 'tiren removing the inateriai of the depth penetrated bythe dye along extended area tnereloy formrecessed clear aree. for use asa sound area and enen filling said recessed area Rochester, New erinthis ugust 15.929

